<template>
  <div id="cesiumContainer"></div>
</template>

<script>
// import * as Cesium from 'cesium/Cesium'
// import 'cesium/Widgets/widgets.css'

export default {
  name: 'PolylineGeometry',
  mounted() {
    let viewer = this.initCesium()

    this.addPolylineGeometry(viewer)
  },
  methods: {
    initCesium: function () {
      Cesium.Ion.defaultAccessToken =
        'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJqdGkiOiJkZjg4ZjljZC1mZGM3LTRlZjEtYjg3MC00MjZkNGU3YjI5ZWUiLCJpZCI6MTU5NTIsImlhdCI6MTYwNTE0ODM5OX0.LjxeKrgAo7Ksk8405kSAhYwF0nKcF2w2DGJnKHh51N8'
      let viewer = new Cesium.Viewer('cesiumContainer', {
        animation: false,
        baseLayerPicker: false,
        fullscreenButton: false,
        geocoder: false,
        homeButton: false,
        infoBox: true,
        sceneModePicker: false,
        navigationHelpButton: false,
        scene3DOnly: true,
        timeline: false,
        selectionIndicator: false, //是否显示选取指示器组件
        shouldAnimate: false, //自动播放动画控件
        shadows: true, //是否显示光照投射的阴影
        terrainShadows: Cesium.ShadowMode.RECEIVE_ONLY, //地质接收阴影
        sceneMode: Cesium.SceneMode.SCENE3D,
        clock: new Cesium.Clock(),
        terrainProvider: new Cesium.EllipsoidTerrainProvider()
      })
      viewer._cesiumWidget._creditContainer.style.display = 'none' //	去除版权信息
      return viewer
    },
    addPolylineGeometry(viewer) {
      let positions = []
      let colors = []
      for (let i = 0; i < 40; ++i) {
        positions.push(Cesium.Cartesian3.fromDegrees(-100.0 + i, 48.0))
        colors.push(
          Cesium.Color.fromRandom({
            alpha: 1.0
          })
        )
      }

      // A polyline with two connected line segments
      let polyline = new Cesium.PolylineGeometry({
        positions: positions,
        width: 10.0,
        colors: colors
      })
      let geometry = Cesium.PolylineGeometry.createGeometry(polyline)

      let polygonInstance1 = new Cesium.GeometryInstance({
        geometry: geometry,
        id: 'polygonInstance1'
      })

      let primitive = new Cesium.Primitive({
        geometryInstances: [polygonInstance1],
        asynchronous: false, //是否采用多线程
        appearance: new Cesium.PolylineColorAppearance({
          translucent: false, //半透明
          flat: true //当 true 时，片段着色器中将使用平面阴影，这意味着不考虑光照
        })
      })

      viewer.scene.primitives.add(primitive)
    }
  }
}
</script>
